I'm not seeing the aesthetic similarity between the Mac and the Alto, except that they're both beige, have a mouse, and are taller than wide. What specifically do you see in common?
Monitors back then were wide then and the Alto turned the screen on its side. The Mac somewhat similarly had a screen that wasn't wide. The Mac mouse is also copied from the Alto's if you look at the shape.
I'm not following you here - the Mac had a wide monitor, standard 4:3 CRT, totally unlike the Alto's portrait display. The Mac's mouse had one button, while the Alto's mouse had three buttons. Both had a rectangular shape, but that's the obvious shape to use (see Engelbart's mouse).